I don't and never owned a 6.5x55 or a 260 Rem but I've shot a few of each.
I do own and hunt with a .257 Roberts, .25-06, and a .270 Win and the recoil of the 6.5x55 is in between the .25-06 and the .270 Win but there is not a lot of difference.
I would get the Swede because you can used heavier bullets.